code: def _double_factorial(n):
      """The double factorial function for small Python integer `n`."""
      return np.prod(np.arange(n, 1, -2))
  
file_path: probability/tensorflow_probability/python/internal/special_math.py
imports: import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import dtype_util
label_desc: Use image node_id 6 for calling a global function with example usage: _double_factorial(n) and returns: np